✅ Verified

Parts of An Atom

artist's representation of an atom. Bohr's Model. Colors may be labelled different.

Symbol of An Atom

(picture on the left) An example of an atom symbol, (picture on the right) The format of an atom symbol (FOR INDONESIA)

Determining the number of Protons, Electrons, and Neutrons

Protons and Electrons

If not electrically charged (will be discussed later), the proton and electron number will be the same as the atom number.

Neutrons

Neutrons can be determined by using this following formula:
Atomic Mass - Atomic Number = Neutron Number

Examples

Proton: 11
Electron: 11
Neutron: 23 - 11 = 12

Proton: 6
Electron: 6
Neutron: 12 - 6 = 6

Ions

Electron count will be added or subtracted by ion charge.
If the ion charge is positive (cation / kation), subtract the electron count.
If the ion charge is negative (anion), add the electron count. For example:

Proton: 6
Electron: 6 + 4 = 10
Neutron: 12 - 6 = 6

Proton: 6
Electron: 6 - 2 = 4
Neutron: 24 - 12 = 12